Re: L7 makes alot of smoke
|
Bob,
That 2700 volts is a tad bit on the high side, perhaps.
73,
Evan, K9SQG
On Tuesday, April 23, 2024 at 05:54:31 PM EDT, K6OXN Bob <bobk6oxn@...> wrote:
The power supply has the Harbach mod done and has been working great. Of course when this happens only the .82 fuse resistor blows. I do notice some possible arc points on the cover of the L7 and will place some Fish paper in that area.? After the first repair, I left the amp on in idle with HV at 2700+ and had no problems for over 4 hours in that state. Now it seems that the arcing is taking out the 47 ohm parasitic resistors when I am modulating in SSB.? Only tested on 40 meters at this time and cannot see any parasitic oscillations on the scope. Replacing the parasitic resistors now along with the .82 in the PS.? Will bring it up slowly and may try SSB with the amp in CW mode unless that is not recommended. Otherwise, I will reduce the TR7 to about 50 watts and see how it is doing.
73? Bob
|
